Overmolding for medical devices and surgical applications

Overmolding is a manufacturing process in which a substrate - typically a thermoplastic or metal component - is molded with an additional material, often liquid silicone rubber (LSR), through injection molding. This process can be performed in semi-automated or fully automated production environments.

In medical device manufacturing, overmolding is widely used to create composite products that require strong bonding, precision, and high-performance material properties. It is particularly suitable for applications where multiple functionalities must be integrated into a single component.

This process creates a permanent bond between materials, eliminating the need for adhesives or secondary assembly.

Overmolding offers several key advantages for medical and healthcare devices:

• Enables fully bonded multi-material components
• Eliminates the need for secondary assembly processes
• Improves product reliability and durability
• Enhances design flexibility and functionality
• Provides cost-effective manufacturing solutions
• Supports ergonomic and user-friendly device design

This makes overmolding an ideal solution for producing complex and high-performance medical components.

Manufacturers use two primary overmolding applications to meet specific operational challenges:

• Single-shot overmolding: Applying one overmolding application to a substrate.
• Multi-shot / 2K molding: Applying different textures or colors in multiple molded layers.

Engineers excel in bonding a wide range of materials to create custom polymer solutions. Our experts combine silicones (LSR and HCR), thermoplastic elastomers, and metals such as stainless steel and titanium. Whether your instrument requires a soft-touch handle, multi-shot molding for added texture or a complex interface between materials, our highly experienced team delivers proven expertise grounded in years of real-world application.

• Silicone (LSR and HCR): biocompatible, flexible, and ideal for medical environments
• Thermoplastics: provide structural strength and stability
• Metals: such as stainless steel, commonly used for surgical and orthopedic instruments

These material combinations allow manufacturers to optimize both mechanical performance and user experience.

Engineers must ensure strong bond integrity between material interfaces (e.g. metal to silicone or silicone to thermoplastic). Reliable bonding prevents delamination, reduces the risk of bacterial ingress, and ensures long-term performance and safety in critical medical environments.

Overmolding for orthopedic surgical instruments is a manufacturing process that applies a soft-touch, ergonomic surface over a rigid substrate to improve a surgeon’s grip and control. By combining materials such as stainless steel and medical-grade silicone, overmolding enhances precision, reduces hand fatigue, and ensures reliable performance in demanding surgical environments.

Medical professionals rely on overmolded surgical instruments for their durability during repeated sterilization cycles and their ability to maintain strong bond integrity, helping to prevent bacterial contamination.

Learn more about overmolded surgical instruments!

Overmolding is used across a wide range of medical and healthcare applications, including:

• Hospital and home care devices
• Biotechnology and laboratory equipment
• Fluid management systems
• Diagnostic and monitoring devices

By combining materials and functionalities, overmolding helps you create more compact, efficient, and reliable medical products.

Our dedicated medical manufacturing environment and experienced overmolding specialists ensure consistent quality and precision in the production of medical devices and overmolded surgical instruments.

Driven by innovation, we combine advanced silicone overmolding technologies with deep multi-material engineering expertise to develop high-performance, next-generation healthcare solutions. By continuously improving processes and leveraging innovative material combinations, we help customers bring more sophisticated, reliable, and user-focused medical devices to market faster.

With a strong focus on quality, precision, and innovation, we provide the confidence that your mission-critical components are manufactured to the highest standards - supporting performance, safety, and long-term success in demanding medical and orthopedic applications.